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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448b1b57221cc78fc824faa1a595b48c0b461b384a75d29539ef59ffa3a79630' 
  AND token = 'WPGivbr6oq1SvnC9P64WCrnFEpXXjKo0lrZ19vlU5kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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