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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc191a168a1a993c7296225a4ce7baa7486d79e65e8b224978a30fcd7b81311' 
  AND token = 'A9H8preuDAs+2R660hbotxoSokYmjMyzrEhO6E7iwEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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