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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6688b30f2b3554a5a18895695e2831a42bb5b35a56eb18a84630737a2d81cc47' 
  AND token = '0oCuo4g5W8jRtNYnNedW0cT/2uy/hn5SE5VZvjUzPp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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