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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c14ae031377da2de23a41f57dd6998f2268eb9e44b247aa791516eacde4e897' 
  AND token = '7lWh93lUcQYPwy59w7SLlT8hqWii6Se+D89TkOfR+uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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