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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d1379126e44c268a85aa23ab7ed5990b0c97c68f565ea88a3f70f5ba20dd74' 
  AND token = 'SQIoiuvbvF8mjGO0E5/ZK2TNf5I0RPokK9zHjAAOvv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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