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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0c8e568f386ea550705d79bc9c0621f0f5e35374a80c2e88b1d42397341bcf' 
  AND token = 'u2L0J74GsQ0H3hWSlU1Y5G6Rdwt43MPM8qCLahCQr1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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