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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41fc7bf650f37d877be0ffd236cd4febf455ed7682b852761e21cef4abd919e' 
  AND token = '9qiUqnF9IffLWp+Ny1ObMw2fiTCOwdmvs3ijdrQBKlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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