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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6adb3cdab3e44a9da57b2ce145a330a6bb2653ccebad58849b85d2ecf3dafde2' 
  AND token = 'PhG/2Jj7Bj0s8XNRgWbYxFg6ddf9mymJ5YgYdMgz4TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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