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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884bee159d9aad9a7ef36a9b85e83001877c710ddc163e3af36e53385ee65f0d' 
  AND token = 'wky2bYxFFps0QSCeIVuxEWmHwciwYZoOb8ffTWldeMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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