SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7e7fccd9a2f434029344dfe562d98053c2f17d8c00ccdd7266d7f0480d2c34' 
  AND token = 'npAGNO+wQixHkR8k4gKjla/UYrHxZSUvx0ogVBKvWbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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