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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ced69a97db73689678326d9d075012ed63ebb8cc2961509bdfad0ddf08c1994' 
  AND token = 'T+gb78EcrGTJbYeF+GIk7T6boZnn9sSxeip8ku+a2DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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