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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a27bf09a6cd6db6c75d5ea46c79e0694f54a88c11b9366b08566ca49dd1e03b' 
  AND token = 'GF3oC29a67cq5ka76ajdmKbbLG++km3OtmCjKYIBdF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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