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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f996b85c7b8c51904c454e39da05d7b23e67fe7c0c0cfebd2cb1c12c63eda9a4' 
  AND token = 'zLclFcYS0i0WReqnZcfjm7Afs19A6n53cY1FdRwj1UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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