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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88dce4f30cc802830815030c851ac88e18b2cc6063b7398fab7bbdb8e8abfea' 
  AND token = 'ptA0Rca4SF3P/ITxpYOlNScjZS+PAd+nl7Jn1TSA5es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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