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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c43815a9f48134b58102590d7d97d38daec6b38a56317715cd4088d3bf506a' 
  AND token = 'HxVzAYVK/0qPFMYkp7wUNNXDNn575nWv68IRcsbwFWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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