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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b7e249aeb9f4e9092c7e53e70ba1b578f54b30cc5eaea6b1c664f7c0aa2c52' 
  AND token = 'KEQkrUf4w4tH6hxq9I2cKiFT8flOFelcnktAztjbIB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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