SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1479b9694088a6e5f4bdbba74830c3185b0b3f16903f90571a8bbc6687bf2c4' 
  AND token = 'actQ44y5Vcii2Jt0XAgxumqvUT3zVHDvlVZfgJGjUzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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