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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5317aacbfeed3bfb5ddf1417394bd3e5973c734d51f3c5d204697fd22127227e' 
  AND token = '1buaZypDHUO5mXE/s3r1nnha+S+T/OJYaS8gbaye/0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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