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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc191e74c2f8cc4e03df2fb7a4ce374b4c8d03cce6e4e866256e1803d8a35f9' 
  AND token = 'J8tL4qRMmgCC5x9ohfLhyxXIH+ZAeM7qoLEIulCcKLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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