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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadae3ec8acb27a5bc0bdff3a7889ec0662d6efdd6a5e7018e1633a2423d9cde' 
  AND token = 'jbJ1oHBz57MIxVWZd6KIpMvupUZMu1uu4pDrD/YjnxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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