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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74683a2ce65773f79968d82a4e948f71cef8038c6bdc245eded545af6e0c876' 
  AND token = '0b8M0diwqJd8npi5shW2Wnd5iKILpqvy3BZd3gHOkaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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