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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9406458e198d3587a1f6ba0d5541594eeba58738a6ad8d185e6b18851166720a' 
  AND token = 'jIj3QKBknyNnrhsH2Q8R7DHyvAbfdtBP7R0s+3DptPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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