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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da67157e1777f5edbf2c485c5096abe3723af423815fde146ec8979e0b28c57' 
  AND token = 'v/XQ3n38o6GYrZiZpNtn7My1r+i/Q+ae5ZvGz4G8lPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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