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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae584696cc957b8fa48629d8e61b09942bf034f2827c5a35c1db179e5e9134e' 
  AND token = 'suclNTid/I7TPGATq2KEHW1/5LuDJD/uKg+YReL27pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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