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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35bae95283d5b04b6e1aa2a8708a431caf8419f6454c37683c05862302b8f59e' 
  AND token = 'VnN6gbKIQYHM8WxxTy5kiOXXrz2JxJWAvknbTKs31tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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