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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdab335fcea2d0ebd3fae125e34eb2749dfa0c31011595580815307f37000ad' 
  AND token = 'ATi13l3y/0NPIJP0k/yD8fLJ5uwGBzX00EyhMDqnpUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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