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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a028d3ef459f0704ba4bfd5a5b91789c0ece02f9cb39294a94e03504332d5c92' 
  AND token = 'yi2iQ4r/U4h++8dFlHhMGzeLSqJSYY9LQBFhyHIje2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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