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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaac65247bb351486b34d8653886cd0f00a54686eb5703b7f7465ea97499b89d' 
  AND token = 'V0f4qCxsX/pMQrwfe5HJ84Qh5D5jftE6wXDx8cx3nSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

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