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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6cc1ca80b25ec30e79030c4a88a6f1adadbbaa6e62ea493c429723f57942b9' 
  AND token = 'Dp8p9N7eZtelNI4mIGgKELbYVUbztwblk1+16fOazdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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