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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbe9ab30af35e2dc5bdd3c0325780ed23688aaba86e50bd14a4ea773eda1066' 
  AND token = 'kTAi9vcKmGBVigDH+QI7T0HybFnGWmy/s2DeofFFfoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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