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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd24b04115d4c5c77ec1bbced2c974c9a0db7f0c5a709abdab9ef6f83d9c03e' 
  AND token = 'HOZlyz6WkHNM52GkLOGciMNOnwj72Z4YzBOuZR8ERQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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