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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88972f297780e0a40f41ef1c2568d71434425230559fd5b4f64b94fa7b7be124' 
  AND token = '9hg8jX3ir/xH3l99WHA4arNJ6jNgVp9RuaeZxfIgQfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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