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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7e41478c58eaef036a3aa78bbd17baf597470ca1da88f2fc6eb7b1f931ae91' 
  AND token = 'C82wFt6TA2TeX/Hl0MGFtRxepVK8Yh/4CGk21snE8eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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