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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad96e8f7fd862edcbec91ad0c1462b521f883d008e4992569f729710e423af5e' 
  AND token = 'S1mOaf+Rx3RqPwecUSxSMSW/tdyKgu2du6d0GmMBcac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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