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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ddf180ea9248151f26aa32e330d98aa7c7e01b28d1cc455269b5fa44fdb9a1' 
  AND token = 'g3KxmW5OuaNgdQp5WFa4Q9UfxbvomBrrHZeBh5afsic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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