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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2a6b1ea82bd8f600afce3b508a44cfb6a17f0332ce313db702848122e38fea' 
  AND token = 'F9t00+y3adNtaWEzrpXv0GnCC68ogDlj8b/XIzWO+Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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