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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a423d740b420e3320681dcd8d35719c84d1c063bcb26e0c4fa1965cda5360861' 
  AND token = 'ksLGQj7VIqadu0nZqZPk3xRP1dv+jA2EY3HekfCPFOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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