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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3df5e9045d45719cc600a224e03cf7c98b11832ed321a6dee980391ef7deee' 
  AND token = 'AROdLDTEwFT90glBV263Wqi0YBR5ewSdWEKZPuA3Xis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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