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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4909c890f10740f0ee1460816c21b1cdc9fd9a4e37ae4e758e7805331c9d85d6' 
  AND token = 'nTRKtVo+MvLMPmthtKXar4R2+1Q8mqKcJqfE1HXzQKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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