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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a140dc4803d42277c2d4268c94a23d128777ecadf61492a8a3c5ac4d885d252' 
  AND token = 'GFbBdpIfG/njkblguHq1hV+ckc9DpbKlT1ml/RGHFdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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