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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820618fa8b49fcdf62078394aa2eb6cc2856923ca76472678c4cfaebddbad616' 
  AND token = 'nI0kgU6YTwJ4C4AjNrzA8v2xhaw95qHR2xI4Si1Nt2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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