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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9794a6ab956c728fd8edd35b0b6777fb8d88896a29b03cc0c7324eaeef82707a' 
  AND token = 'NUruSqA5CDuL5Ms9xwtU0o080Im1w4lP1YtWi7RC4JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}