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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c633d7fe5c7008ef5590bd0e1d5b01ea995d65ef84cfaf8f39f442e3629c0fb5' 
  AND token = 'cWnUNbSkHGBw3K6QyWK12ixlJ+B4yH44zj0IqUC9rMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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