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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2369c377a7962936b1bd158f582a7ca8f1f99c7837773a676f1e1e0db6ef75' 
  AND token = 'URqA9l/Q6vflKm227UNaf0J5w5OKHny4CjruZU5GPo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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