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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fe63d39cf501a0e0161304a27c6f59456b2ff5b150a43595c46b902202e1ae' 
  AND token = 'tzsJ3c8goD47utsGo8py8EScudHznohCS5L2iOg2q0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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