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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b673b4b372f86e6b7981b12d043ae2d61b3eadd28f7e8fcd8c203034ebeff347' 
  AND token = 'HBcs40xZZSprqVu8osyOfn+UiBy2eNYoh5x39OJW0Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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