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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f33ebac1777c9bfe49aadf4f7988c46bdc7d94ad8cc99413ab169f871b97acb' 
  AND token = '0I03zdtRyfFok4XrRO3U/GojDcL4ZN07+b4zRayCp9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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