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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b1935361a40b9271f97fb4fc4d1f07e075c36550551dc387a9bea0943d9bb8' 
  AND token = '9rZxwAQa0ILP0DpOLPThPtCot/HtaV1twSu+FkLjvxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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