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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d6ae14d4998d802e561edd5f90325fc119749fbc0307dc8e07f69d1998e524' 
  AND token = 'B6sufrSf2JRGpF95gfuKjBpze9/GPF/hn7DsDS8bFvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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