SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20773a9fb337aee5284a66db5671d90ef6b2ff55127122a6d49f3e25ccff2d0c' 
  AND token = 'fw+UnGKG9asp/YgAle8fWCX+vIVz2oF1c64wHqfFYmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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