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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ed40b14164f52d9858126d62b7804a16a8eb3883083b009b4909c0f2320edd' 
  AND token = 'smC6LWBBo5qlwnwhJ9xsSVDTvT0n73dodFFUBDKXdIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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