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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df0cc6cb11d74ed6399682cf90b4b21c34cce048e84989733423e2b855ef8cc' 
  AND token = 'bkwhcJwUJq07kubLGI2udsOLkObia8yVUhZgNqtRcyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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