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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a400741a66c2bb0f9685dadad6ba5c9d9c315ab917ce80ea3bf3cd82abd344bf' 
  AND token = 'zJgpfAYawEnBSarcjeDXj1eh8XJ9zU1gTPDAGyr2HBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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