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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6015690a5a5a786410f4a6224a384c8247fbed0dfc5de3cfc921c452740d31' 
  AND token = 'x8ZTErwM1vzUoM8uKBX1Pu7wSG+iKZ/bal9n5ncruH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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